functional

1practical and useful; with little or no decorationsynonymutilitarianBathrooms don't have to be purely functional.The office was large and functional rather than welcoming.

2having a special purpose; making it possible for somebody to do something or for something to happena functional disorder (= an illness caused when an organ of the body fails to perform its function)a functional approach to language learningThese units played a key functional role in the military operation.

3(especially of a machine, an organization or a system)working; able to workThe hospital will soon be fully functional.

Extra examplesItems such as musical instruments may be both functional and aesthetically pleasing.The office is a functional working area, designed with efficiency in mind.We’ve lost hope of having a fully functional hospital.